How hot does the R/R run? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 14 (permalink) Old 08-01-2008, 09:44 AM Thread Starter
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How hot does the R/R run?

I recently checked, cleaned, dielectric greased the three stator wires that plug together behind the motor and the result is 14.5 to 14.8 volts at the MF battery and a hotter r/r. My thought is more current is flowing (the plugs were in poor shape) so the r/r is hotter, but how hot is a normally running r/r? I checked the verses, Clymer, and called the local Kawa dealer (not help there except bring it in and we'll check it for $$$).

Thanks all...

DT

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post #2 of 14 (permalink) Old 08-01-2008, 10:58 AM
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I've never seen a rating for the temp of the RR. I imagine that the different manufacturers will have different temps. I have a Rick's RR, I'll try to get a temp reading off of it tonight after I drive home.

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post #3 of 14 (permalink) Old 08-01-2008, 03:00 PM
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Mine gets quite toasty after just a few minutes of running. Not too hot to touch but darn close.

Jim W
93 VN 750 "Ursula"
Moved R/R 08Sep06
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post #4 of 14 (permalink) Old 08-01-2008, 03:18 PM
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They can get quite hot. I think we had a member hookup a thermocuple with a temp gauge and got it up to 150 degrees F. That would be too hot to touch for more than a few seconds.. BTW.

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post #5 of 14 (permalink) Old 08-01-2008, 04:39 PM
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Anybody have one of those digital, laser thermometer's?
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post #6 of 14 (permalink) Old 08-01-2008, 05:27 PM Thread Starter
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Ouch!

Quote:
Originally Posted by Sky Rider View Post
Mine gets quite toasty after just a few minutes of running. Not too hot to touch but darn close.
Seems that my connection was not passing much current to the R/R. This is a good description of the heat Sky Rider, thanks. I was surprised with the smallness of the wires too. What are they? 16 or 18 gauge? Anyone replace them with 14 gauge (I know about the fusing and I think I'll do that this winter).

Quote:
Originally Posted by Knifemaker View Post
They can get quite hot. I think we had a member hookup a thermocuple with a temp gauge and got it up to 150 degrees F. That would be too hot to touch for more than a few seconds.. BTW.
KM
Thanks KM, I have a cooling fan from a computer processor that would mount to the R/R fins, think that would have a effect? 150 would burn the hand quite easily.

DT

95 VN750 (eBay)31k+
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OEM high back rest
'V-Twin' HWY pegs
Black 750 Spectre handlebars
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R/R Relocate
Dry Splines Lubed
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Sporster XL Mufflers
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Pickup coil mod to .45mm
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post #7 of 14 (permalink) Old 08-01-2008, 05:32 PM
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Quote:
Originally Posted by 750Doug View Post
Anybody have one of those digital, laser thermometer's?
I do, but with my bike not running I wouldn't be able to check. If anyone is running up this way I'll have it at home, too bad I'm not online there. But Ccspinner has my number.

Gee I'm not alot of help.

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post #8 of 14 (permalink) Old 08-01-2008, 07:18 PM
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Quote:
Originally Posted by dirtrack650 View Post
.. I have a cooling fan from a computer processor that would mount to the R/R fins, think that would have a effect? ....


This was proposed a few years back, and one of our engineers figured that the energy needed to run the fan would only offset the amount of heat it caused , and would not cool off the R/R more than just moving it from out under the battery box and relocating by the passenger peg (as so many do now)

Hard to find a computer fan that puts out 30-75 mph air. When the bike is stopped at a light, the first sentance would be the case, the fan would just barely cool the R/R , while it was just adding more strain to the electrical system. (You'd be better off keeping a bottle of water with you and squirting some on the unit while waiting for the light to change)

Do understand that these things are supposed to get hot, this was a factor in their design. But many feel that the stock placement -inside the bike and right above part of the exhaust system- added more heat than the original design calculated for.

I have always felt that many get a bit too paranoid about this item, but it does make "good logic" to move them where they can get a better flow of air.
Unless you have a pretty big motor on a fan, your not going to match the amount of air you get by simply riding the bike.


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post #9 of 14 (permalink) Old 08-02-2008, 01:45 AM
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another thaught on a computer fan....they run on 1.5 or 5 volts...are bikes range between 12 and 14.5 v way too much for the small fans..
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post #10 of 14 (permalink) Old 08-02-2008, 09:44 AM
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Quote:
Originally Posted by dirtrack650 View Post
I was surprised with the smallness of the wires too. What are they? 16 or 18 gauge? Anyone replace them with 14 gauge (I know about the fusing and I think I'll do that this winter).
The stator leads are very small and the fact that they get hot during operation testifies to their high resistance under load. I have not measured the voltage drop over the 16 inches (or so) of lead, but I measured the wire size when I replaced it all and decided it was 18 AWG. I replaced the stator leads with Teflon coated 14 AWG wire when I replaced the stator and used 12 AWG for the R/R output and ground leads and they run cool now. The R/R itself (relocated) still gets pretty toasty.

Darrel
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